function receive(prod)
	local status,value = coroutine.resume(prod)
	return value
end

function send(x)
	coroutine.yield(x)
end

function producer()
	return coroutine.create(function ()
		while true do
			local x = io.read()--create new value
			send(x)
			end
	end)
end

function filter(prod)
	return coroutine.create(function ()
		forline =1, math.huge do
			local x = receive(prod)--get new value
			x = string.format("%5d %s",line,x)
			send(x)
		end
	end)
end

function consumer(prod)
	while true do
		local x = receive(prod)
		io.write(x, "\n")
	end
end

--[[
p = producer()
f = filter()

consumer(f)

--]]

consumer(filter(producer()))
